1&period;Small in size&comma;light weight&comma;easy to carry&comma;ease to use&comma;economic&comma;durable and reliable2&period;Good performance&comma; with automatic compensation for voltage fluctuation3&period;Stable are deep molten pool&comma;perfect welding shaping4&period;Low open enegy wastage&comma;energy-saving5&period;Widely used for the sheet welding of stainiess steel produce hardware and so on&period;